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<pre><span class="comment"> /****************************************************************************
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 ** Copyright (C) 2005-2008 Trolltech ASA. All rights reserved.
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 #include &quot;commands.h&quot;

 static const int setShapeRectCommandId = 1;
 static const int setShapeColorCommandId = 2;

<span class="comment"> /******************************************************************************
 ** AddShapeCommand
 */</span>

 AddShapeCommand::AddShapeCommand(Document *doc, const Shape &amp;shape, QUndoCommand *parent)
     : QUndoCommand(parent)
 {
     m_doc = doc;
     m_shape = shape;
 }

 void AddShapeCommand::undo()
 {
     m_doc-&gt;deleteShape(m_shapeName);
 }

 void AddShapeCommand::redo()
 {
     <span class="comment">//</span> A shape only gets a name when it is inserted into a document
     m_shapeName = m_doc-&gt;addShape(m_shape);
     setText(QObject::tr(&quot;Add %1&quot;).arg(m_shapeName));
 }

<span class="comment"> /******************************************************************************
 ** RemoveShapeCommand
 */</span>

 RemoveShapeCommand::RemoveShapeCommand(Document *doc, const QString &amp;shapeName,
                                         QUndoCommand *parent)
     : QUndoCommand(parent)
 {
     setText(QObject::tr(&quot;Remove %1&quot;).arg(shapeName));
     m_doc = doc;
     m_shape = doc-&gt;shape(shapeName);
     m_shapeName = shapeName;
 }

 void RemoveShapeCommand::undo()
 {
     m_shapeName = m_doc-&gt;addShape(m_shape);
 }

 void RemoveShapeCommand::redo()
 {
     m_doc-&gt;deleteShape(m_shapeName);
 }

<span class="comment"> /******************************************************************************
 ** SetShapeColorCommand
 */</span>

 SetShapeColorCommand::SetShapeColorCommand(Document *doc, const QString &amp;shapeName,
                                             const QColor &amp;color, QUndoCommand *parent)
     : QUndoCommand(parent)
 {
     setText(QObject::tr(&quot;Set %1's color&quot;).arg(shapeName));

     m_doc = doc;
     m_shapeName = shapeName;
     m_oldColor = doc-&gt;shape(shapeName).color();
     m_newColor = color;
 }

 void SetShapeColorCommand::undo()
 {
     m_doc-&gt;setShapeColor(m_shapeName, m_oldColor);
 }

 void SetShapeColorCommand::redo()
 {
     m_doc-&gt;setShapeColor(m_shapeName, m_newColor);
 }

 bool SetShapeColorCommand::mergeWith(const QUndoCommand *command)
 {
     if (command-&gt;id() != setShapeColorCommandId)
         return false;

     const SetShapeColorCommand *other = static_cast&lt;const SetShapeColorCommand*&gt;(command);
     if (m_shapeName != other-&gt;m_shapeName)
         return false;

     m_newColor = other-&gt;m_newColor;
     return true;
 }

 int SetShapeColorCommand::id() const
 {
     return setShapeColorCommandId;
 }

<span class="comment"> /******************************************************************************
 ** SetShapeRectCommand
 */</span>

 SetShapeRectCommand::SetShapeRectCommand(Document *doc, const QString &amp;shapeName,
                                             const QRect &amp;rect, QUndoCommand *parent)
     : QUndoCommand(parent)
 {
     setText(QObject::tr(&quot;Change %1's geometry&quot;).arg(shapeName));

     m_doc = doc;
     m_shapeName = shapeName;
     m_oldRect = doc-&gt;shape(shapeName).rect();
     m_newRect = rect;
 }

 void SetShapeRectCommand::undo()
 {
     m_doc-&gt;setShapeRect(m_shapeName, m_oldRect);
 }

 void SetShapeRectCommand::redo()
 {
     m_doc-&gt;setShapeRect(m_shapeName, m_newRect);
 }

 bool SetShapeRectCommand::mergeWith(const QUndoCommand *command)
 {
     if (command-&gt;id() != setShapeRectCommandId)
         return false;

     const SetShapeRectCommand *other = static_cast&lt;const SetShapeRectCommand*&gt;(command);
     if (m_shapeName != other-&gt;m_shapeName)
         return false;

     m_newRect = other-&gt;m_newRect;
     return true;
 }

 int SetShapeRectCommand::id() const
 {
     return setShapeRectCommandId;
 }</pre>
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